Radius-setting gauge

ABSTRACT

A radius-setting gauge for direct attachment to the frame of a radius dresser, including a movable micrometer to be set to the required radius, and an indicator for indicating the position of the micrometer.

Elmted States Patent 1151 3,636,636

Baldyga 1 Jan. 25, 1972 [54] RADIUS-SETTING GAUGE [56] References Cited [72] Inventor: Joseph W. Baldyga, Utica, Mich. UNITED STATES PATENTS [73] Assignee: Diamond Die & Mold Co., Mount Clemens, 711,763 10/1902 Fox et al .....33/172 MiCh- 2,533,024 10/1950 Lustrik ..33/185 [22] Filed: oct- 24,1969 2,736,310 2/1956 Baumann ..]25/11 [21 App]. No.: 869,149 Primary Examiner-Leonard Forman Assistant Examiner-Charles E. Phillips 52 us. c1 ..33/185, 125/111 Hume" Belknap [51 Int. Cl ..B27g 23/00 581 116111 of Search ..33/169 0, 172 D, 181 R, 185 R; [57] ABSTRACT A radius-setting gauge for direct attachment to the frame of a radius dresser, including a movable micrometer to be set to the required radius, and an indicator for indicating the position of the micrometer.

6 Claims, 3 Drawing Figures RADIUS-SETTING GAUGE SUMMARY OF THE INVENTION Radius dressers are provided for use with grinding wheels and include means for rotating a dressing diamond in an arc of predetermined radius while in proximity to the periphery of a grinding wheel. With this arrangement, back and forth oscillation of the diamond in its are as the wheel is rotated will result in dressing or trimming the periphery of the wheel to a corresponding cross-sectional radius. The diamond is adjustable so that it may be employed to dress a convex or concave surface of arcuate cross section on the wheel.

According to the present invention, means are associated directly with the dresser to facilitate adjustment of the diamond to a position in which it is caused to traverse an arc of the required radius. Specifically, this is accomplished by providing a rigid arm attachable in exactly fixed relation to the frame of the dresser, the arm having thereon a micrometer having an extension or stem extending toward the axis of rotation of the spindle on the dresser. The micrometer as a whole is movable on the arm radially with respect to the axis of the dresser spindle. Suitable position determining and indicating means, such as a dial indicator, is mounted on the arm and has a stem engageable with means movable with the micrometer.

A setup pin is provided having a head having opposed spherical portions. The pin is mounted on the dresser on an adjustable slide with its axis parallel to the axis of the spindle. The micrometer is set to extend the stem to a position where it will be engaged by the spherical head. Thereafter, the slide carrying the setup pin is moved toward the micrometer until the micrometer as a whole is moved away from a seat to some intennediate position. At this time the position of the micrometer is noted by observing the reading on the dial indicator.

Thereafter, the dresser is rotated through l80 to bring the opposite spherical surface of the head of the setup pin into proximity to the stem of the micrometer which is then permitted to engage the head of the setup pin. The reading of the dial indicator is noted and if it is identical with the reading obtained when the first surface of the heat engaged the stem of the micrometer, then the spherical head of the setup pin is centered on the axis of the spindle.

If the reading of the dial indicator, after the spindle has been rotated through 180, differs from the original reading, then the slide carrying the setup pin is adjusted until identical readings are obtained with the spindle in positions 180 apart.

At this time the dial of the dial indicator is zeroed. Since the micrometer extension engages the setup pin at a point located above the axis of rotation of the dresser by a distance equal to one-half the diameter of the head of the setup pin, the device is calibrated so that if a diamond is substituted for the setup pin, and maintains the micrometer in the same position, and zeros the indicator, its operating radius will be equal to the radius of the ball head of the setup pin. If a different radius is required, a corresponding adjustment of the micrometer is made and when the diamond has been thereafter adjusted to a position which, through its engagement with the extending stem of the micrometer, has moved the micrometer to position the dial indicator at zero, the diamond will have been adjusted to the required position.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation, partly in section, of a radius dresser and a self-contained but detachable setting gauge.

FIG. 2 is a fragmentary elevation of a diamond trimming tool associated with the radius dresser.

FIG. 3 is an enlarged fragmentary view showing the coaction between the micrometer and dial indicator.

DETAILED DESCRIPTION The setting gauge disclosed herein and the radius dresser for which it is designed, constitute a novel combination although the particular radius dresser to which the gauge is applied has been in use. However, it has not been used in combination with a setting gauge attachable through the dresser to form a self-contained adjustable radius dresser. The radius dresser comprises a frame 10 having an elongated spindle housing 12 through which extends a rotatable spindle 13 the axis of which is indicated at I4. Attached to the forward end of the spindle 13 is a member 16 having guide means such as a key 18 provided thereon and extending radially of and crossing the axis 14 of the spindle 13. The base 20 is adjustable along the guide 18 and may be fixed in adjusted position by suitable means (not shown). Extending from the base 20 is an elongated sleeve 22 which is adapted to receive a pin 24 at the outer end of which is mounted a block 26 adapted to support a diamond trimming element 28. The pin 24 is received in an opening in the sleeve 22 and may be given a slight angular adjustment by means of screws 30 and 32, the screw 32 constituting a fineadjustment screw for the diamond 28.

Attached to the rear end of the spindle I3 is a spindle rotating knob 34 by means of which the spindle may be rotated back and forth so as to swing the diamond 28 in an arcuate path about the axis 14 of the spindle. It will be readily apparent that the radius of the arcuate path in which the point or trimming surface of the diamond 28 swings, may be adjusted by adjustment of the base 20 along guide 18.

The problem which is solved by the present combination of structure is to position the diamond 28, either by adjustment of the base 20 or by adjustment of the pin 24, so that the cutting or trimming point of the diamond is spaced from the axis 14 of the spindle 13 by precisely the required amount. Heretofore, this has been accomplished by means of gauges set up on the surface supporting the radius dresser or a special surface plate. In accordance with the present invention, means associated directly with and attachable to the dresser are provided for the purpose of adjusting the radius of movement of the diamond as required.

For this purpose there is provided a rigid arm 40 which is intended for quick attachment to and detachment from the frame 10 of the dresser. The arrangement is such that when attached thereto, the arm 40 assumes identical positions. In order to accomplish this, accurately finished surfaces indicated generally at 42 and 44 are provided on the frame 10 of the dresser and the arm 40 has corresponding accurately finished locating surfaces engageable therewith. In addition, attachment screws 46 and 48 are carried by the arm and have threaded extensions engageable in threaded recesses provided 7 in the seats 42 and 44 to insure positive and accurate location of the rigid arm 40.

The forward or free end of the arm 40 is provided .with a through opening 50 which may conveniently be of generally rectangular cross section and which receives a tubular slide 52 for free vertical movement thereon. Conveniently, antifriction balls (not shown) are provided in suitable ways between the surfaces of the opening 50 and the slide 52. Mounted in fixed position in the slide 52 is a micrometer gauge indicated generally at 54 having a stem 56 which occupies the plane in which the diamond 28 swings. The extension 56 extends radially toward the axis of the spindle 13. The micrometer gauge includes a rotatable barrel 58 including graduations 60 associated with indicia 62 to provide for a measured extension of the stem 56 from the locating surface provided by the upper surface surrounding opening 50 in the end of arm 40.

The arm 40 includes an enlarged generally circular opening 64 which includes a dial indicator 66 having a pointer 68 and a knob 70 for rotating the dial to bring the zero indication thereon into any predetermined position.

The dial indicator 66 includes a stem 72 which extends through a diagonal opening 74 communicating with the through opening 50. The slide 52 which carries the micrometer 58, is provided with a notch 76 against which the end of the dial indicator stem 72 engages. With this arrangement vertical movement of the slide 52 and the associated micrometer 54 results in related movement of the dial indicator stem 72 and accordingly, rotation of the pointer 68 thereon.

In order to provide initial setup or calibration of the instrument there is provided a setup pin indicated generally at 80 which includes an elongated cylindrical pin 82 having a head 84. The head 84 may be spherical or it may simply have two diametrically opposed portions which are spherical, the rest of the head being relieved. It is however essential that the center of the sphere or of the spherical portions be located on the axis of the pin 82. Moreover, it is essential that the diameter of the spherical head portion be accurately known. Finally, it is essential that in setup the elongated cylindrical pin 82 of the setup pin shall occupy a position parallel to the axis 14 of the spindle 13. Since the adjustment screws 30 and 32 may be used to displace the pin 24 which carries the diamond 28, as seen in FIG. 2, for fine adjustment, it is important to determine that the screws 30 and 32 are so adjusted when using the setup pin 80 that the cylindrical pin thereof shall be in strict parallelism with the axis 14 of the dresser.

With this arrangement the micrometer is set to read a dimension which will extend the stem to be engaged by the head 84 of the setup pin. At this time the base 20 carrying the sleeve 22 is adjusted vertically to bring the spherical head 84 of the setup pin into proximity to the axis 14 of the dresser spindle 13. The micrometer stem 56 at this time is fixed in adjusted position such that the micrometer as a unit is displaced upwardly from its lower stopped or rest position determined by engagement with the top surface of the outer end of the arm. This upward displacement of the sleeve 52 and the micrometer carried thereby, will result in actuation of the dial indicator 66 and rotation of the pointer 68 thereof to some intermediate position.

At this time the micrometer is lifted to clear the stem 56 from the head 84 of the setup pin and the spindle of the dresser is rotated 180. The micrometer is then lowered until the stem 56 engages the spherical surface of the setup pin opposite the surface thereof which was first contacted. If the dial indicator at this time reads exactly the same as when the first surface of the setup pin was contacted, then the base 20 is in the position such that the head 84 is centered with respect to the spindle axis l4. If this condition does not exist then minor adjustments of the base 20 are made until identical readings are obtained on the dial indicator with the head 84 of the setup pin rotated through 180. At this time the micrometer is in a position such that the lower end of its stem 56 is spaced above the axis 14 of the dresser spindle by precisely the radius of the spherical head 84. At this time the dial of the dial indicator is adjusted to read zero with respect to the pointer 68, irrespective of the position occupied by the pointer. The setting instrument is now calibrated.

In order to set a diamond to any desired radius for trimming a grinding wheel, the setup pin is now removed and the pin 24 carrying the diamond dressing or trimming element is positioned in the sleeve 22. To avoid injury to the diamond and to avoid wear on the lower end of the stem 56 of the micrometer, it is usual to insert a thin anvil of known thickness therebetween. The micrometer is now adjusted to provide the required extension of the stem 56 for any desired radius of curvature, taking into account the thickness of the interposed anvil if this is used. Thereafter, the structure is adjusted either by adjusting the base 20 of the sleeve 22 along the guide 18 or by adjusting the angularity of the diamond pin 24 through the agencies of the screws 30 and 32 until this adjustment has lifted the micrometer to the position in which the dial indicator reads zero. At this time the trimming point of the diamond 28 is at the required radius.

The foregoing construction provides an additional useful function in that after the diamond has been adjusted as described above, the knob 34 may be rotated back and forth slightly to observe if the micrometer is lifted slightly by such operation. This will occur if the diamond dresser happens to have a high point displaced laterally from the assumed high point which would in fact become the dressing portion during normal use. If this occurs then, of course, a further adjustment is required to set the high point of the dresser at the required radius.

With the foregoing construction there is provided a selfcontained setting instrument attachable directly to the dresser which can be used to provide accurate setting of the diamond to swing in the desired arc for trimming concave or convex arcuate cross section surfaces on the grinding wheel. In normal usage, after calibration of the setting gauge, adjustment of the diamond to any required radius is a simple and quick operation.

Since the setting gauge is quickly detachable from the dresser by simple loosening of the two screws 46 and 48, the setting gauge may be removed from the dresser when not in use and quickly replaced whenever required.

What I claim as my invention is:

l. A radius-setting gauge for use with a radius dresser having a frame, a rotary spindle in said frame, and a dressing element rotatable with and adjustable radially of said spindle, said gauge comprising:

a rigid arm;

means for attaching said arm to the frame of said dresser in accurately located position with one end portion located in the plane of rotation of the element;

a micrometer carried by said arm at the said one end portion and having an adjustable stem extending toward the element;

a slide mounting said micrometer for sliding movement therewith relative to said arm in a direction radially of the spindle of the dresser;

a dial indicator carried by said arm having a plunger operatively coupled with said slide; and

a setup pin for said dresser adapted to be mounted as an extension of the dresser spindle, said pin having a head provided with opposed setup surfaces of known equal spacing from the axis of said pin in position to engage the stem of said micrometer.

2. A gauge as defined in claim I in which the head of said setup pin comprises opposed concentric spherical surfaces, the center of said surfaces being located on the axis of said pin to be thereby positioned on the axis of the dresser spindle.

3. A gauge as defined in claim 1, said arm having a through opening at its outer end, said slide being freely movable in said opening from a rest position radially outwardly from the axis of the spindle of the radius dresser, said micrometer being fixedly carried by said slide for movement therewith radially of said spindle as a result of engagement with the end of the stem of said micrometer by said setup pin or said element.

4. A gauge as defined in claim 3, said arm having an inclined opening in communication with said through opening, said dial indicator having a stem extending through said inclined opening into engagement with said slide for actuation thereof.

5. The method of adjusting a radius dresser having a frame, a rotary spindle in said frame, and a diamond support rotatable with and adjustable radially of said spindle to a required radius which comprises mounting directly on the radius dresser frame in fixed position an arm supporting a microme- .i'

ter having a stem extending radially toward the axis of said spindle and a measuring device, said micrometer being bodily movable radially of the axis of said spindle parallel to the direction of movement of said stem, said measuring device having an extending stem movable upon movement of said micrometer;

mounting on said diamond support a setup pin having a pair of opposed surfaces spaced apart in a direction perpendicular to the axis of said spindle; setting said micrometer to extend the stem in position to be engaged by said pin; moving said diamond support toward said micrometer to displace said micrometer by engagement between one of said surfaces and the end of said stem, reading the indicated position of said micrometer on said measuring device while the micrometer is positioned by engagement with said pin; rotating said spindle to bring the other of said surfaces into engagement with the stem of said micrometer; measuring the second position of said micrometer;

dimension thereof; and

adjusting said diamond support to displace said micrometer to its zero position.

6. The method as defined in claim 5 which comprises swinging said diamond through a small arc while in contact with the micrometer to measure that the area thereof furthest from the axis of the spindle is set to the required radius for trimming. 

1. A radius-setting gauge for use with a radius dresser having a frame, a rotary spindle in said frame, and a dressing element rotatable with and adjustable radially of said spindle, said gauge comprising: a rigid arm; means for attaching said arm to the frame of said dresser in accurately located position with one end portion located in the plane of rotation of the element; a micrometer carried by said arm at the said one end portion and having an adjustable stem extending toward the element; a slide mounting said micrometer for sliding movement therewith relative to said arm in a direction radially of the spindle of the dresser; a dial indicator carried by said arm having a plunger operatively coupled with said slide; and a setup pin for said dresser adapted to be mounted as an extension of the dresser spindle, said pin having a head provided with opposed setup surfaces of known equal spacing from the axis of said pin in position to engage the stem of said micrometer.
 2. A gauge as defined in claim 1 in which the head of said setup pin comprises opposed concentric spherical surfaces, the center of said surfaces being located on the axis of said pin to be thereby positioned on the axis of the dresser spindle.
 3. A gauge as defined in claim 1, said arm having a through opening at its outer end, said slide being freely movable in said opening from a rest position radially outwardly from the axis of the spindle of the radius dresser, said micrometer being fixedly carried by said slide for movement therewith radially of said spindle as a result of engagement with the end of the stem of said micrometer by said setup pin or said element.
 4. A gauge as defined in claim 3, said arm having an inclined opening in communication with said through opening, said dial indicator having a stem extending through said inclined opening into engagement with said slide for actuation thereof.
 5. The method of adjusting a radius dresser having a frame, a rotary spindle in said frame, and a diamond support rotatable with and adjustable radially of said spindle to a required radius which comprises mounting directly on the radius dresser frame in fixed position an arm supporting a micrometer having a stem extending radially toward the axis of said spindle and a measuring device, said micrometer being bodily movable radially of the axis of said spindle parallel to the direction of movement of said stem, said measuring device having an extending stem movable upon movement of said micrometer; mounting on said diamond support a setup pin having a pair of opposed surfaces spaced apart in a direction perpendicular to the axis of said spindle; setting said micrometer to extend the stem in position to be engaged by said pin; moving said diamond support toward said micrometer to displace said micrometer by engagement between one of said surfaces and the end of said stem, reading the indicated position of said micrometer on said measuring device while the micrometer is positioned by engagement with said pin; rotating said spindle to bring the other of said surfaces into engagement with the stem of said micrometer; measuring the second position of said micrometer; adjusting said diamond support until the two positions of said micrometer are identical to determine a zero micrometer position; replacing said setup pin with a dressing diamond, setting said micrometer to a dimension corresponding to the required radius setting for said diamond, after the two indicated positions are identical, zeroing the measuring device to provide for a zero reading thereof when said diamond is adjusted to move the micrometer to a preset dimension thereof; and adjusting said diamond support to displace said micrometer to its zero position.
 6. The method as defined in claim 5 which comprises swinging said diamond through a small arc while in contact with the micrometer to measure that the area thereof furthest from the axis of the spindle is set to the required radius for trimming. 